Perhaps you should try some spelling variations:
"dung moi trong slippers" » "dung moi truong slippers", "dung doi trong slippers", "dung hoi trong slippers", "dung mo trong slippers", "dung mot trong slippers", "dung moi trong slippery", "dung moi trong grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung moi trong slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung moi trong slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung moi trong slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung moi trong slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.